[Perl/perl5] 1515f8: op/sprintf2.t: skip extended precision test on AIX

[Tony Cook via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 1515f807817872eac26fdb0ff7469e2b71ebc6b5
      
https://github.com/Perl/perl5/commit/1515f807817872eac26fdb0ff7469e2b71ebc6b5
  Author: Tony Cook <t...@develop-help.com>
  Date:   2023-05-17 (Wed, 17 May 2023)

  Changed paths:
    M t/op/sprintf2.t

  Log Message:
  -----------
  op/sprintf2.t: skip extended precision test on AIX

This was failing in smokes on AIX